25828981 has 2 divisors, whose sum is σ = 25828982. Its totient is φ = 25828980.

The previous prime is 25828927. The next prime is 25828993. The reversal of 25828981 is 18982852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23136100 + 2692881 = 4810^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 25828981 - 2¹⁷ = 25697909 is a prime.

It is a super-2 number, since 2×25828981² = 1334272518996722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25828081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12914490 + 12914491.

It is an arithmetic number, because the mean of its divisors is an integer number (12914491).

Almost surely, 2^25828981 is an apocalyptic number.

It is an amenable number.

25828981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25828981 is an equidigital number, since it uses as much as digits as its factorization.

25828981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 43.

The square root of 25828981 is about 5082.2220533936. Note that the first 3 decimals coincide. The cubic root of 25828981 is about 295.5986350032.

The spelling of 25828981 in words is "twenty-five million, eight hundred twenty-eight thousand, nine hundred eighty-one".